PURPOSE: To obtain fine particles for coating without contamination with impurities by dissolving solid macromolecular starting material for coating in a supercritical phase using carbon dioxide and a polar organic solvent and effecting rapid expansion, as the production process is simplified, production energy costs are reduced and particle size of the polymer is controlled by temperature and pressure operations.
CONSTITUTION: (A) A polymerization reaction solution in the polymerization process for producing the starting material of solid macromolecule for coating is dissolved in the supercritical phase using (B) carbon dioxide and (C) a polar solvent and rapidly expanded to give this fine particles. It is preferred that any of methanol, ethanol, propanol or acetone be used as component (C) and the size distribution of the macromolecular fine particles to be produced be controlled by adjusting at least one of the pressure, temperature and formulation of the supercritical solution.
YAMAGUCHI SHOHACHIRO
UMEMOTO HIROTOSHI
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